from sqlalchemy.orm import backref
from datetime import datetime
from app import db
from werkzeug.security import generate_password_hash,check_password_hash
from flask_login import UserMixin
from app import login
from hashlib import md5
 

class User(UserMixin,db.Model):
    __tablename__ ='user'
    about_me = db.Column(db.String(140))
    last_seen = db.Column(db.DateTime, default=datetime.utcnow)
    id = db.Column(db.Integer,primary_key=True)
    username = db.Column(db.String(64),index=True,unique=True)
    email = db.Column(db.String(120),index=True,unique=True)
    password_hash=db.Column(db.String(128))
    posts =db.relationship('Post',backref='author',lazy='dynamic')
    def __repr__(self):
        return '<用户名:{}>'.format(self.username)
    def set_password(self,password):
       self.password_hash=generate_password_hash(password)
    def check_password(self,password):
        return check_password_hash(self.password_hash,password)
    def avatar(self,size):
        digest = md5(self.email.lower().encode('utf-8')).hexdigest()
        return 'https://www.gravatar.com/avatar/{}?d=identicon&s={}'.format(
            digest, size)
class Post(db.Model):
    __tablename__='post'
    id=db.Column(db.Integer,primary_key=True)
    body=db.Column(db.String(140))
    timestamp=db.Column(db.DateTime,index=True,default=datetime.utcnow)
    user_id=db.Column(db.Integer,db.ForeignKey('user.id'))
    def __repr__(self):
        return '<Post {}>'.format(self.body)
@login.user_loader
def load_user(id):
    return User.query.get(int(id))
class ContactModel(db.Model):
    __tablename__ = 'contact'

    id = db.Column(db.Integer, primary_key = True)
    name = db.Column(db.String(120))
    email = db.Column(db.String(120))
def save_to_db(self):
        db.session.add(self)
        db.session.commit()
